Raw film
In photography and film production, raw film refers to unexposed film material, namely negative film , reversal film and direct reversal film . Raw film is usually delivered ready-made by the manufacturer, i.e. in certain sizes and perforated to match the respective film format . Raw film is sold as sheet material in sheet film packs, as roll film on a core or spool in a light-tight bag and in a glued box, with the exception of Super-8 and Single-8 film, which are packed in disposable cassettes.
The previously exclusively used raw film based on nitrocellulose has been replaced by the security film based on acetylcellulose that is used today because of its flammability and the property of developing explosive gases. Such films are marked with "Safety-Film" or "S" (DIN 15551). The plastic-based film materials (polyester, polycarbonate) that are now common today also comply with international safety regulations.
Raw film should be kept refrigerated until exposure. If the product is stored for a long time or is improperly stored, color changes and loss of sensitivity occur.